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ssb: Add SPROM fallback support

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This adds SSB functionality to register a fallback SPROM image from the
architecture setup code.

Weird architectures exist that have half-assed SSB devices without SPROM attached to
their PCI busses. The architecture can register a fallback SPROM image that is
used if no SPROM is found on the SSB device.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Florian Fainelli <florian@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2009-02-27 16:59:05 +01:00 • committed by John W. Linville
parent e31ae05083
commit e79c1ba84c
4 changed files with 54 additions and 1 deletions
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14
drivers/ssb/pci.c
View file

@ -564,6 +564,7 @@ static int sprom_extract(struct ssb_bus *bus, struct ssb_sprom *out,
static int ssb_pci_sprom_get(struct ssb_bus *bus,
struct ssb_sprom *sprom)
{
const struct ssb_sprom *fallback;
int err = -ENOMEM;
u16 *buf;
@ -583,12 +584,23 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
bus->sprom_size = SSB_SPROMSIZE_WORDS_R4;
sprom_do_read(bus, buf);
err = sprom_check_crc(buf, bus->sprom_size);
if (err)
if (err) {
/* All CRC attempts failed.
* Maybe there is no SPROM on the device?
* If we have a fallback, use that. */
fallback = ssb_get_fallback_sprom();
if (fallback) {
memcpy(sprom, fallback, sizeof(*sprom));
err = 0;
goto out_free;
}
ssb_printk(KERN_WARNING PFX "WARNING: Invalid"
" SPROM CRC (corrupt SPROM)\n");
}
}
err = sprom_extract(bus, sprom, buf, bus->sprom_size);
out_free:
kfree(buf);
out:
return err;